geometry basics

point

a location and has no size. it has no dimension. represented by a dot

line

has one dimension. it is represented by a line with two arrowheads, but it extends infinitely.through any two points, there is exactly one line

plane

two dimensions, represented by a shape that looks like a floor of wall, but is infinite

coplanar

points and lines that lie on the same plane

collinear

points and lines that lie on the same line

segment or line segment

part of a line that has two points called endpoints

ray

part of a line that has one endpoint and all points of the line on one side of the endpoint

opposite ray

two rays that share the same endpoint and form a line

AB (line on top= CD (line on top)

“is congruent to”

AB=CD

“is equal to”